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Unread 01-11-2006, 06:03 PM   #1
mikegp1
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30" tires on Stock ZJ

I have a 96 Grand Cherokee Laredo that is stock for now. I am planning on lifting it very soon, but i need new tires and i was wondering if I can fot 30x9.5 r15 on the stock jeep. That way once I lift it i have the tires on it already. If i cant fit those what can I fit that will be good when I lift it.

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Unread 01-11-2006, 06:04 PM   #2
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30s fit like a glove - I ran them on the road and wheeled them pretty good before my BB. You'll be fine and dandy.
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Unread 01-11-2006, 06:09 PM   #3
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my 255/70r16s (28.5") rubbed on the front bumper when I would backup and have the wheel turned. So you may and maynot be able to make it work. It comes down to how much your springs have settled. All of that said, it should work but no guaranties.
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Unread 01-11-2006, 06:15 PM   #4
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Wow...only time I've heard that happen was on an XJ with really saggy springs (not mine, my bro-in-law). I had no issues forward or back, flexed or not. V's right though...every rig is different. I just know I had no issues.
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Unread 01-11-2006, 06:24 PM   #5
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big tire group from wrangler is awsome on a grand cherokee.....30 9.5 -15 on those 8 inch wide canyon rims....once again I dont see why jeep didnt do that in the first place...they look great and work great. Go for it..... heck if your getting a lift you might want to go bigger 31's 32' even..... but you will need a lift to offroad for sure.
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Unread 01-11-2006, 06:30 PM   #6
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If only doing a BB, I wouldn't really recommend 32s. Not so much for the rub, and the fact that you really can't stuff those into a stock rig, but when you hit 32, you start running into gearing issues. I don't know if Mike has the 3.73 gears that come with the Class IV towing group, but on 3.55s, I've heard that 32s bringeth the suck as far as power and fuel economy goes.

That's also assuming that Mike is only planning on doing a BB - if going higher, 32s would fit, but they would rub like hell before the lift.

Take a look at http://www.kevinsjeepparts.com/zj/zjlifts.html. Kev has a great chart of tire sizes and recommended lift. 32s don't even come into the picture until 3.5" and above.
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Unread 01-11-2006, 06:34 PM   #7
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I am planning a 3.5 inch lift in the next few weeks. I have the 5.2 in my jeep. Is this going to kill the rear or do I need to change gears. The biggist tire ill go with a lift is probably 31 in the future. These tires that I ahve now are down to about 5/32 and suck in the rain and the snow. So I figured go with a bigger tire and better one.
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Unread 01-11-2006, 06:39 PM   #8
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Mike,

all your questions about gears and stuff can be answered if you read the first ten or so pages.

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Unread 01-11-2006, 06:41 PM   #9
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If it's only a few weeks before you get your lift, why don't you revisit the tire decision afterward? Having the 5.2 doesn't necessarily mean that you've got the gearing in the diffs to turn those big meats. Check your build sheet (you can request one from http://www.jeep.com) to see if you have the tow group. Also, a trailer hitch being there already can be a hint.

3.5" should fit 32s just fine. Fair warning, your fuel economy WILL go down.
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Unread 01-11-2006, 06:50 PM   #10
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Before and after pics from the same week.

Stock suspension on 30x9.5 GSA's -



31's, Cragar Steelies, 2" BB. Sorry for the blurry pic, the only picture of my Jeep totally stock besides that setup.




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Unread 01-11-2006, 06:57 PM   #11
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if you have a v8 you will be ok on 32's as far as driving goes - you will not be setting any land speed records, but it will go.

get the 3.5" lift and then go with 32x11.50 tires. you will be very happy you did.

BB wasn't good enough for me, so i got +1 springs to go in there as well. now i am at the limit of stock control arms.
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Unread 01-11-2006, 07:39 PM   #12
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Quote:
Originally Posted by Varkyl
my 255/70r16s (28.5") rubbed on the front bumper when I would backup and have the wheel turned. So you may and maynot be able to make it work. It comes down to how much your springs have settled. All of that said, it should work but no guaranties.
Maybe thats because 255/70r16 os 30.0 inch diameter, not 28.5"

(255mm/25.4mm/in * 70/100)" * 2 + 16" = 30.0"
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Unread 01-11-2006, 10:16 PM   #13
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Quote:
Originally Posted by SecondZJ
Maybe thats because 255/70r16 os 30.0 inch diameter, not 28.5"

(255mm/25.4mm/in * 70/100)" * 2 + 16" = 30.0"
correct the numbers don't lie. But when the tire is measure top to bottom and left to right it is under 29" when inflated to 35 psi.

now I am going to have to check to see if I have the 70's or 65's but I know for a fact they are the 255's.
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Unread 01-12-2006, 08:28 AM   #14
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Quote:
Originally Posted by Varkyl
correct the numbers don't lie. But when the tire is measure top to bottom and left to right it is under 29" when inflated to 35 psi.
Yeah...cars are kind of heavy Try measuring it w/the tire off the ground if you really want to do it that way. But the "metric" tire size conversion can easily be found online.
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Unread 01-12-2006, 09:00 AM   #15
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yep tires off the ground top to bottom, side to side under 29" (about 28.7-8").
And they are 255/65R16. And they have maybe 9k miles on them. I need to find my depth gauge and then I will be able to give the tread depth.
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